Distinction between the Youngest Toba Tuff and Oldest Toba Tuff from northern Sumatra based on the area density of spontaneous fission tracks in their glass shards

John A. Westgate, Nick Pearce, Emma Gatti, Hema Achyuthan

Research output: Contribution to journalArticlepeer-review

10 Citations (SciVal)

Abstract

Determination of the area density of spontaneous fission tracks (ρs) in glass shards of Toba tephra is a reliable way to distinguish between the Youngest Toba Tuff (YTT) and the Oldest Toba Tuff (OTT). The ρs values for YTT, uncorrected for partial track fading, range from 70 to 181 tracks/cm2 with a weighted mean of 108 ± 5 tracks/cm2, based on 15 samples. Corrected ρs values for YTT are in the range of 77–140 tracks/cm2 with a weighted mean of 113 ± 8 tracks/cm2, within the range of uncorrected ρs values. No significant difference in ρs exists between YTT samples collected from marine and continental depositional settings. The uncorrected ρs for OTT is 1567 ± 114 tracks/cm2 so that confusion with YTT is unlikely.

The ρs values of the Toba tephra at Bori, Morgaon, and Gandhigram in northwestern India indicate a YTT identity, in agreement with geochemical data on their glass shards, the presence of multiple glass populations, and a glass fission-track age determination. Therefore, the view of others that OTT is present at these sites – and thereby indicates an early Pleistocene age for the associated Acheulean artifacts – is incorrect
Original languageEnglish
Pages (from-to)82
Number of pages2
JournalQuaternary Research
Volume82
Issue number2
Early online date05 Aug 2014
DOIs
Publication statusPublished - Sept 2014

Keywords

  • volcanic glass shards
  • spontaneous fission tracks
  • partial track fading
  • Toba tuffs
  • Acheulean artificats
  • Sumatra
  • India

Fingerprint

Dive into the research topics of 'Distinction between the Youngest Toba Tuff and Oldest Toba Tuff from northern Sumatra based on the area density of spontaneous fission tracks in their glass shards'. Together they form a unique fingerprint.

Cite this